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WORKING TECHNIQUES

English

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115 13 81-26 Rev.3 2009-01-14

Before use:

1

Check that the chain brake works correctly and is not 
damaged.

2

Check that the rear right hand guard is not damaged.

3

Check that the throttle lockout works correctly and is 
not damaged.

4

Check that the stop switch works correctly and is not 
damaged.

5

Check that all handles are free from oil.

6

Check that the anti vibration system works and is not 
damaged.

7

Check that the muffler is securely attached and not 
damaged.

8

Check that all parts of the chain saw are tightened 
correctly and that they are not damaged or missing.

9

Check that the chain catcher is in place and not 
damaged.

10 Check the chain tension.

General working instructions

Basic safety rules

1

Look around you:

To ensure that people, animals or other things cannot 
affect your control of the machine.

To make sure that none of the above might come 
within reach of your saw or be injured by falling trees.

CAUTION! Follow the instructions above, but do not use a 
chain saw in a situation where you cannot call for help in 
case of an accident.

2

Do not use the machine in bad weather, such as 
dense fog, heavy rain, strong wind, intense cold, etc. 
Working in bad weather is tiring and often brings 
added risks, such as icy ground, unpredictable felling 
direction, etc.

3

Take great care when removing small branches and 
avoid cutting bushes (i.e. cutting many small branches 
at the same time). Small branches can be grabbed by 
the chain and thrown back at you, causing serious 
injury.

4

Make sure you can move and stand safely. Check the 
area around you for possible obstacles (roots, rocks, 
branches, ditches, etc.) in case you have to move 
suddenly. Take great care when working on sloping 
ground.

5

Take great care when cutting a tree that is in tension. 
A tree that is in tension may spring back to its normal 
position before or after being cut. If you position 
yourself incorrectly or make the cut in the wrong place 
the tree may hit you or the machine and cause you to 
lose control. Both situations can cause serious 
personal injury.

IMPORTANT!

This section describes basic safety rules for using a 
chain saw. This information is never a substitute for 
professional skills and experience. If you get into a 
situation where you feel unsafe, stop and seek expert 
advice. Contact your chain saw dealer, service agent or 
an experienced chain saw user. Do not attempt any task 
that you feel unsure of!

Before using a chain saw you must understand the 
effects of kickback and how to avoid them. See 
instructions under the heading How to avoid kickback.

Before using a chain saw you must understand the 
difference between cutting with the top and bottom 
edges of the bar. See instructions under the headings 
How to avoid kickback and Machine’s safety equipment.

Wear personal protective equipment. See instructions 
under the heading Personal protective equipment.

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Summary of Contents for 115 13 81-26

Page 1: ... ng g g gl l l li i i is s s sh h h h 115 13 81 26 Rev 3 2009 01 14 445 445e 450e Operator s manual Please read the operator s manual carefully and make sure you understand the instructions before using the machine ...

Page 2: ... the nose or tip of the guide bar touches an object and cause a lightning fast reverse reaction kicking the guide bar up and towards the operator May cause serious personal injury Other symbols decals on the machine refer to special certification requirements for certain markets Symbols in the operator s manual Switch off the engine before carrying out any checks or maintenance CAUTION The start s...

Page 3: ...7 FUEL HANDLING Fuel 19 Fuelling 20 Fuel safety 20 STARTING AND STOPPING Starting and stopping 21 WORKING TECHNIQUES Before use 23 General working instructions 23 How to avoid kickback 29 MAINTENANCE General 31 Carburettor adjustment 31 Checking maintaining and servicing chain saw safety equipment 31 Muffler 33 Starter 34 Air filter 35 Spark plug 36 Lubricating the bar tip sprocket 36 Needle beari...

Page 4: ...construction industry Husqvarna s aim is also to be in the front edge according to ergonomics usability security and environmental protection That is the reason why we have developed many different features to provide our products within these areas We are convinced that you will appreciate with great satisfaction the quality and performance of our product for a very long time to come The purchase...

Page 5: ...screws carburettor 10 Starter handle 11 Starter 12 Chain oil tank 13 Product and serial number plate 14 Felling direction mark 15 Front handle 16 Front hand guard 17 Muffler 18 Chain 19 Bar tip sprocket 20 Bar 21 Spike bumper 22 Chain catcher 23 Chain tensioning screw 24 Clutch cover 25 Right hand guard 26 Throttle control 27 Throttle lockout 28 Chain tensioner wheel 445e 450e 29 Knob 445e 450e 30...

Page 6: ...of the machine As the machine is equipped with a spring loaded stop switch and can be started by low speed and force on the starter handle even small children under some circumstances can produce the force necessary to start the machine This can mean a risk of serious personal injury Therefore remove the spark plug cap when the machine is not under close supervision IMPORTANT The machine is only d...

Page 7: ...chine s safety features and their function are explained For inspection and maintenance see instructions under the heading Checking maintaining and servicing chain saw safety equipment See instructions under the heading What is what to find where these parts are located on your machine The life span of the machine can be reduced and the risk of accidents can increase if machine maintenance is not ...

Page 8: ...and when moving over short distances to reduce the risk of moving chain accidentally hitting your leg or anyone or anything close by Do not leave the chain saw switched on with the chain brake activated for long periods The chain saw can become very hot To release the chain brake pull the front hand guard backwards towards the front handle Kickback can be very sudden and violent Most kickbacks are...

Page 9: ...kickback No First your brake must be in working order Testing the brake is simple see instructions under the heading Checking maintaining and servicing chain saw safety equipment We recommend you do before you begin each work session Second the kickback must be strong enough to activate the chain brake If the chain brake is too sensitive it would activate all the time which would be a nuisance Wil...

Page 10: ...imate there is a high risk of fires These areas are sometimes subject to government rules requiring among other things the muffler must be equipped with an approved type of spark arrestor mesh WARNING Overexposure to vibration can lead to circulatory damage or nerve damage in people who have impaired circulation Contact your doctor if you experience symptoms of overexposure to vibration Such sympt...

Page 11: ...gned to reduce kickback The only way to avoid kickback is to make sure that the kickback zone of the bar never touches anything By using cutting equipment with built in kickback reduction and keeping the chain sharp and well maintained you can reduce the effects of kickback Bar The smaller the tip radius the lower the chance of kickback Chain A chain is made up of a number of links which are avail...

Page 12: ...l If the chain is very blunt it will produce wood powder and no chips or shavings A sharp chain eats its way through the wood and produces long thick chips or shavings The cutting part of the chain is called the cutter and consists of a cutting tooth A and the depth gauge B The cutters cutting depth is determined by the difference in height between the two depth gauge setting When you sharpen a cu...

Page 13: ... The cutting teeth should be newly sharpened before adjusting the depth gauge setting We recommend that you adjust the depth gauge setting every third time you sharpen the cutting teeth NOTE This recommendation assumes that the length of the cutting teeth is not reduced excessively You will need a flat file and a depth gauge tool We recommend that you use our depth gauge tool to acheive the correc...

Page 14: ...the bar nuts while lifting the tip of the bar at the same time Check that you can pull the chain round freely by hand and that it does not sag from the underside of the bar The position of the chain tensioning screw on our chain saws varies from model to model See instructions under the heading What is what to find out where it is on your model 445e 450e Release the knob by folding it out Turn the...

Page 15: ...lasts longer than the oil and that you also use the recommended cutting equipment a bar that is too long will use more chain oil Checking chain lubrication Check the chain lubrication each time you refuel See instructions under the heading Lubricating the bar tip sprocket Aim the tip of the bar at a light coloured surface about 20 cm 8 inches away After 1 minute running at 3 4 throttle you should ...

Page 16: ...as worn down to only 4 mm the chain must be replaced Bar Check regularly Whether there are burrs on the edges of the bar Remove these with a file if necessary Whether the groove in the bar has become badly worn Replace the bar if necessary Whether the tip of the bar is uneven or badly worn If a hollow forms on the underside of the bar tip this is due to running with a slack chain To prolong the li...

Page 17: ... correctly located in the groove in the bar Tighten the bar nuts finger tight Tension the chain by turning the chain tensioning screw clockwise using the combination spanner The chain should be tensioned until it does not sag from the underside of the bar The chain is correctly tensioned when it does not sag from the underside of the bar but can still be turned easily by hand Hold up the bar tip a...

Page 18: ...cket and that the chain is correctly located in the groove in the bar Tension the chain by turning the wheel down The chain should be tensioned until it does not sag from the underside of the bar The chain is correctly tensioned when it does not sag from the underside of the bar but can still be turned easily by hand Hold up the bar tip and tighten the bar knob by turning the knob clockwise When f...

Page 19: ... 10 hours Two stroke oil For best results and performance use HUSQVARNA two stroke engine oil which is specially formulated for our air cooled two stroke engines Never use two stroke oil intended for water cooled engines sometimes referred to as outboard oil rated TCW Never use oil intended for four stroke engines A poor oil quality and or too high oil fuel ratio may jeopardise function and decrea...

Page 20: ...purpose For longer periods of storage or for transport of the chain saw the fuel and chain oil tanks should be emptied Ask where you can dispose of waste fuel and chain oil at your local petrol station Ensure the machine is cleaned and that a complete service is carried out before long term storage The bar guard must always be fitted to the cutting attachment when the machine is being transported ...

Page 21: ... will automatically return to its original setting Air purge 3 Press the air purge diaphragm repeatedly until fuel fills the diaphragm at least 6 times The diaphragm need not be completely filled Push down the red choke control 5 This inactivates the choke which is not needed when starting a warm chain saw However the movement of the start stop switch will have engaged a high idle making warm star...

Page 22: ...hod is very dangerous because you may lose control of the saw Never start the machine indoors Exhaust fumes can be dangerous if inhaled Observe your surroundings and make sure that there is no risk of people or animals coming into contact with the cutting equipment Always hold the saw with both hands The right hand should be on the rear handle and the left hand on the front handle All people wheth...

Page 23: ...ll branches and avoid cutting bushes i e cutting many small branches at the same time Small branches can be grabbed by the chain and thrown back at you causing serious injury 4 Make sure you can move and stand safely Check the area around you for possible obstacles roots rocks branches ditches etc in case you have to move suddenly Take great care when working on sloping ground 5 Take great care wh...

Page 24: ...not let go of the handles 3 Most kickback accidents happen during limbing Make sure you are standing firmly and that there is nothing in the way that might make you trip or lose your balance Lack of concentration can lead to kickback if the kickback zone of the bar accidentally touches a branch nearby tree or some other object Have control over the workpiece If the pieces you intend to cut are sma...

Page 25: ... See instructions under the heading How to avoid kickback Terms Cutting General term for cutting through wood Limbing Cutting branches off a felled tree Splitting When the object you are cutting breaks off before the cut is complete There are five important factors you should consider before making a cut 1 Make sure the cutting equipment will not jam in the cut 2 Make sure the object you are cutti...

Page 26: ...ible can you turn the log stop cutting about 2 3 of the way through the log Turn the log and finish the cut from the opposite side The log is supported at one end There is a high risk that it will split Start by cutting from below about 1 3 of the way through Finish by cutting from above so that the two cuts meet The log is supported at both ends There is a high risk that the chain will jam Start ...

Page 27: ...igh accident risk See instructions under the heading Freeing a tree that has fallen badly Clearing the trunk and preparing your retreat Delimb the stem up to shoulder height It is safer to work from the top down and to have the tree between you and the saw Remove any undergrowth from the base of the tree and check the area for obstacles stones branches holes etc so that you have a clear path of re...

Page 28: ...on Drive a wedge or breaking bar into the cut as soon as it is deep enough Finish the felling cut parallel with the directional cut line so that the distance between them is at least 1 10 of the trunk diameter The uncut section of the trunk is called the felling hinge The felling hinge controls the direction that the tree falls in All control over the felling direction is lost if the felling hinge...

Page 29: ...reduce the tension and make the tree or branch break at the point of maximum tension Never cut straight through a tree or branch that is in tension If you must cut across tree limb make two to three cuts one inch apart one to two inches deep Continue to cut deeper until tree limb bends and tension is released Cut tree limb from outside the bend after tension has been released How to avoid kickback...

Page 30: ...If possible let the weight of the chain saw rest on the trunk Keep the trunk between you and the chain saw as you move along the trunk Cutting the trunk into logs See instructions under the heading Basic cutting technique WARNING A majority of kickback accidents occur during limbing Do not use the kickback zone of the guide bar Be extremely cautious and avoid contacting the log other limbs or obje...

Page 31: ...and the engine speed should be safely below the speed at which the chain starts to rotate Correctly adjusted carburettor When the carburettor is correctly adjusted the machine accelerates without hesitation and 4 cycles a little at full throttle It is also important that the chain does not rotate at idle If the L jet is set too lean it may cause starting difficulties and poor acceleration If the H...

Page 32: ...ingers and thumbs around the handles Apply full throttle and activate the chain brake by tilting your left wrist forward onto the front hand guard Do not let go of the front handle The chain should stop immediately Throttle lockout Make sure the throttle control is locked at the idle setting when the throttle lockout is released Press the throttle lockout and make sure it returns to its original p...

Page 33: ...switch automatically returns to run position In order to prevent unintentional starting the spark plug cap must be removed from the spark plug when assembling checking and or performing maintenance Muffler Never use a machine that has a faulty muffler Regularly check that the muffler is securely attached to the machine Some mufflers are equipped with a special spark arrestor mesh If your machine h...

Page 34: ...ley Wind approx 3 turns of the starter cord on the starter pulley Fit the starter pulley so that the end of the recoil spring D hooks into the starter pulley Now assemble the drive disc spring drive disc and the bolt in the centre of the pulley Carry the starter cord through the hole in the starter housing and the starter handle Tie a good knot on the starter cord Tensioning the recoil spring Hook...

Page 35: ...inst the crankcase Then slowly release the starter cord so that the pulley engages with the pawls Fit and tighten the screws that hold the starter Air filter The air filter must be regularly cleaned to remove dust and dirt in order to avoid Carburettor malfunctions Starting problems Loss of engine power Unnecessary wear to engine parts Excessive fuel consumption Remove the air filter after taking ...

Page 36: ...th a suppressor Lubricating the bar tip sprocket Lubricate the bar tip sprocket each time you refuel Use the special grease gun and a good quality bearing grease Needle bearing lubrication The clutch drum has a needle bearing on the output shaft This needle bearing must be lubricated regularly When lubricating remove the clutch cover by loosening the two bar nuts Lay the saw on its side with the c...

Page 37: ...e air filter and carburettor Special measures are therefore often required Partly mask the air inlet on the starter to increase the working temperature of the engine Temperature 5 C or colder For running the machine in cold weather or powder snow a special cover is available which is mounted on the starter housing This reduces the intake of cold air and prevents large amounts of snow from being su...

Page 38: ...or more even wear Check the lubrication hole in the bar to be sure it is not clogged Clean the bar groove If the bar has a sprocket tip this should be lubricated Lubricate the clutch drum bearing Clean the outside of the carburettor Check that the bar and chain are getting sufficient oil File off any burrs from the edges of the bar Check the fuel filter and the fuel hose Replace if necessary Check...

Page 39: ...Husqvarna PR 17Y NGK BPMR 7A Champion RCJ 7Y Husqvarna PR 17Y Electrode gap mm 0 5 0 5 0 5 Fuel and lubrication system Manufacturer of carburettor Zama Zama Zama Carburettor type EL 37 EL 37 EL 37 Fuel tank capacity litre 0 45 0 45 0 45 Oil pump capacity at 9 000 rpm ml min 13 13 13 Oil tank capacity litre 0 26 0 26 0 26 Type of oil pump Not adjustable Not adjustable Not adjustable Weight Chain sa...

Page 40: ...proved Saw chain filing and file gauges Bar Chain Length inch Pitch inch Gauge mm Max nose radius Type Length drive links no 13 0 325 1 3 10T Husqvarna H30 56 15 0 325 10T 64 16 0 325 10T 66 18 0 325 10T 72 20 0 325 10T 78 13 0 325 1 5 10T Husqvarna H25 56 15 0 325 10T 64 16 0 325 10T 66 18 0 325 10T 72 20 0 325 12T 78 ...

Page 41: ...ssions see the chapter Technical data The following standards have been applied EN ISO 12100 2 2003 CISPR 12 2005 EN ISO 11681 1 2004 Notified body 0404 SMP Svensk Maskinprovning AB Fyrisborgsgatan 3 SE 754 50 Uppsala Sweden has carried out EC type examination in accordance with the machinery directive s 98 37 EC article 8 point 2c The certificates for EC type examination in accordance with annex ...

Page 42: ... z SF 6 z SF 6 115 13 81 26 Rev 3 2009 01 14 ...

Page 43: ...115 13 81 26 Rev 3 2009 01 14 ...

Page 44: ...1151381 26 z SF 6 z SF 6 2009 01 14 115 13 81 26 Rev 3 2009 01 14 ...

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